[Code Monkey]

Just unzip the files to your local hard drive with the directories intact. Then open the folder that says it's contents need to be uploaded to your forum home. Highlight all the contents including the clientscript directory and drag them to your forum home directory in your ftp program. That's your forums home directory not your front page directory if you have one and it's different. Directories that are uploaded will merely merge their files with any directories that already exist in that path with the same name.

Hope that helps